Knife-switch.



J. H. MILLER.

KNIFE SWITCH.

APPLICATION FILED O0T.14,1907.

Patented Ma 11, 1909.

Attonn a s at Bridgeport, in the county of Fairfield and i the hole 15.

sweated together the tap may be carried account of the thinness of the block to drill the same and run securin pins through as is asa simplified construction of improved appcarance.

tached; Fig. 3 is a plan of a block; Fig. 4 is a perspective of a 1 .1s a section on t In the construction of knife switch posts r mrnn sirres rarnn'r o srrcn JOHN H. MILLER-OF BRIDGEPORT, CONNECTICUT, ASSIGUOR TO THE PERKINS ELEGTRIOI' SWITCH MANUFACTURING GOMPAN Y, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT.

KNIFE-SWITCH.

Patented May 11, 1909.

T 0 all whom it may concern: I Be it known that 1, JOHN MiLL'ER, a citizen of the United States of America, residing State of Connecticut, have invented certain new and useful Improvements in Knife- Switchcs, of which the following isa specification.

My invention relates more particularly to the construction \of the joint between the block and the blades of the posts of the switch and has as its object a strong as well In the accompanying diawings Figure 1 is. a side elevation of a switch with posts having my improved construction; Fi 2 is a perspective of a post with one of the blades dci post upside down; and Fig. 5

.e'line c-a, Fig. 1.

having comparatively thin base blocks, it is customar to secure the ost-s to the block by slitting tile end of the atter, inserting the blades which form the post and then sweat ing the parts together. It is impossible on customary with heavy b ocks, so that the manufacturer is at the mercy of the soldered joint above described,'which is quite apt to break when the hole is drilled and tapped for the screw. Furthermorethe split end of the block with the blades of the post showing, detracts from the appearance of the finished article. A more satisfactory post not only in a pearance, but also in strength and du-' rab' ityis made by punching slots 12 in one end of the base leaving a tie stri 13 atthe on the blades as well as on the base. adds rigidity to the structure. It will be noted also that apart from the eiiect of the securing screw, the grooved portion acts as a punch the hole 15 for the securing screw 16. In connection with this I form out or roove the lower ends of the blades to form Iiowcd offsets 17 which conform'to the'contour of Thus after the parts have been up into the grooved portion 17 of the blades, so that the securing screw is given purchase This lateral supporting rib at the base of the blades and gives further stability to the structure as well as presenting a very neat appearance.

I claim as my invention:

1. In a switch terminal for knife switches, blades comprising the post having bowed oil' sets at their lower ends, in combination with a base having a'hole punched from the body thereof to receive the ends of said blades and form with said bowed oifsets thereon a recess adapted to receive a securing means, said hole being spaced from the end of the base to leave a tie strip, substantially as described.

2. In a switch post for knife switches, blade posts provided with downwardly extending tongues and bowed ofisets at their lower ends, in combination with a base having a hole punched from the body thereof to receive said tongues and form. with said bowed ofisets a recess adapted to be threaded to receive a securing screw, said hole being so spaced from the end of the base that the edges of the blades come substantially flush with the said end, substantially as described.

' In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

JOHN H. MILLER.

.Witnesses:

A. H. JoNEs, H. W. GoLDsBoRoUGH. 

